[Effect of saralasin infusion on glomerular filtration rate and sodium excretion in hypertensive patients (author's transl)].

Saralasin (S) infusion, at a dose of 10 micrograms/kg/min IV, decreased Glomerular Filtration Rate (GFR) in 18 hypertensive patients. This effect was more pronounced in those patients with angiotensinogenic hypertension due to the somation of the effects of S upon renal vasculature and systemic arterial pressure. A decrease in urinary sodium excretion was also observed being more intense in those patients whose systemic pressure also decreased during S infusion. In group II (10 hypertensive patients) infusion of S in increasing doses (0.1, 0.5, 1.0, 5.0 and 10.0 micrograms/kg/min) a progressive decrease in GFR was observed only when the arterial pressure also decreased. However urinary sodium excretion decreased progressively as S doses increased. This effect was not related to S effect upon arterial pressure. This observation indicates that S, like angiotensin II, has a direct effect upon the renal tubules evoking an increase of sodium reabsorption.